// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function(CodeMirror) {
    "use strict";

    CodeMirror.defineMode('shell', function() {

        var words = {};
        function define(style, dict) {
            for(var i = 0; i < dict.length; i++) {
                words[dict[i]] = style;
            }
        };

        var commonAtoms = ["true", "false"];
        var commonKeywords = ["if", "then", "do", "else", "elif", "while", "until", "for", "in", "esac", "fi",
            "fin", "fil", "done", "exit", "set", "unset", "export", "function"];
        var commonCommands = ["ab", "awk", "bash", "beep", "cat", "cc", "cd", "chown", "chmod", "chroot", "clear",
            "cp", "curl", "cut", "diff", "echo", "find", "gawk", "gcc", "get", "git", "grep", "hg", "kill", "killall",
            "ln", "ls", "make", "mkdir", "openssl", "mv", "nc", "nl", "node", "npm", "ping", "ps", "restart", "rm",
            "rmdir", "sed", "service", "sh", "shopt", "shred", "source", "sort", "sleep", "ssh", "start", "stop",
            "su", "sudo", "svn", "tee", "telnet", "top", "touch", "vi", "vim", "wall", "wc", "wget", "who", "write",
            "yes", "zsh"];

        CodeMirror.registerHelper("hintWords", "shell", commonAtoms.concat(commonKeywords, commonCommands));

        define('atom', commonAtoms);
        define('keyword', commonKeywords);
        define('builtin', commonCommands);

        function tokenBase(stream, state) {
            if (stream.eatSpace()) return null;

            var sol = stream.sol();
            var ch = stream.next();

            if (ch === '\\') {
                stream.next();
                return null;
            }
            if (ch === '\'' || ch === '"' || ch === '`') {
                state.tokens.unshift(tokenString(ch, ch === "`" ? "quote" : "string"));
                return tokenize(stream, state);
            }
            if (ch === '#') {
                if (sol && stream.eat('!')) {
                    stream.skipToEnd();
                    return 'meta'; // 'comment'?
                }
                stream.skipToEnd();
                return 'comment';
            }
            if (ch === '$') {
                state.tokens.unshift(tokenDollar);
                return tokenize(stream, state);
            }
            if (ch === '+' || ch === '=') {
                return 'operator';
            }
            if (ch === '-') {
                stream.eat('-');
                stream.eatWhile(/\w/);
                return 'attribute';
            }
            if (ch == "<") {
                if (stream.match("<<")) return "operator"
                var heredoc = stream.match(/^<-?\s*['"]?([^'"]*)['"]?/)
                if (heredoc) {
                    state.tokens.unshift(tokenHeredoc(heredoc[1]))
                    return 'string-2'
                }
            }
            if (/\d/.test(ch)) {
                stream.eatWhile(/\d/);
                if(stream.eol() || !/\w/.test(stream.peek())) {
                    return 'number';
                }
            }
            stream.eatWhile(/[\w-]/);
            var cur = stream.current();
            if (stream.peek() === '=' && /\w+/.test(cur)) return 'def';
            return words.hasOwnProperty(cur) ? words[cur] : null;
        }

        function tokenString(quote, style) {
            var close = quote == "(" ? ")" : quote == "{" ? "}" : quote
            return function(stream, state) {
                var next, escaped = false;
                while ((next = stream.next()) != null) {
                    if (next === close && !escaped) {
                        state.tokens.shift();
                        break;
                    } else if (next === '$' && !escaped && quote !== "'" && stream.peek() != close) {
                        escaped = true;
                        stream.backUp(1);
                        state.tokens.unshift(tokenDollar);
                        break;
                    } else if (!escaped && quote !== close && next === quote) {
                        state.tokens.unshift(tokenString(quote, style))
                        return tokenize(stream, state)
                    } else if (!escaped && /['"]/.test(next) && !/['"]/.test(quote)) {
                        state.tokens.unshift(tokenStringStart(next, "string"));
                        stream.backUp(1);
                        break;
                    }
                    escaped = !escaped && next === '\\';
                }
                return style;
            };
        };

        function tokenStringStart(quote, style) {
            return function(stream, state) {
                state.tokens[0] = tokenString(quote, style)
                stream.next()
                return tokenize(stream, state)
            }
        }

        var tokenDollar = function(stream, state) {
            if (state.tokens.length > 1) stream.eat('$');
            var ch = stream.next()
            if (/['"({]/.test(ch)) {
                state.tokens[0] = tokenString(ch, ch == "(" ? "quote" : ch == "{" ? "def" : "string");
                return tokenize(stream, state);
            }
            if (!/\d/.test(ch)) stream.eatWhile(/\w/);
            state.tokens.shift();
            return 'def';
        };

        function tokenHeredoc(delim) {
            return function(stream, state) {
                if (stream.sol() && stream.string == delim) state.tokens.shift()
                stream.skipToEnd()
                return "string-2"
            }
        }

        function tokenize(stream, state) {
            return (state.tokens[0] || tokenBase) (stream, state);
        };

        return {
            startState: function() {return {tokens:[]};},
            token: function(stream, state) {
                return tokenize(stream, state);
            },
            closeBrackets: "()[]{}''\"\"``",
            lineComment: '#',
            fold: "brace"
        };
    });

    CodeMirror.defineMIME('text/x-sh', 'shell');
// Apache uses a slightly different Media Type for Shell scripts
// http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
    CodeMirror.defineMIME('application/x-sh', 'shell');

});
